Contact and barrier dislocation resistance and their effect on characteristics of slip and work hardening

The basic mechanisms of substructure hardening of network and cell dislocation structures were considered in terms of the quantitative data of the TEM investigation of foils and replicas. The comparative analysis of the barrier and contact dislocation resistance was carried out. These types of the dislocation resistance make the main contribution to the work hardening. Sharp distinction of the dislocation ensembles properties where the work hardening is determined by the relations τ∼ρ1/2 and τ∼D−1 was shown. The attention was paid on presence of the softening fluctuation contribution into the flow stress, which is increased with the increase of inhomogeneity of the dislocation distribution.